6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Daniel Machon <daniel.machon@xxxxxxxxxxxxx>
[ Upstream commit 8a6be4bd6fb319cee63d228e37c8dda5fd1eb74a ]
When port mirroring is added to a port, the bit position of the source
port, needs to be written to the register ANA_AC_PROBE_PORT_CFG. This
register is replicated for n_ports > 32, and therefore we need to derive
the correct register from the port number.
Before this patch, we wrongly calculate the register from portno /
BITS_PER_BYTE, where the divisor ought to be 32, causing any port >=8 to
be written to the wrong register. We fix this, by using do_div(), where
the dividend is the register, the remainder is the bit position and the
divisor is now 32.
Fixes: 4e50d72b3b95 ("net: sparx5: add port mirroring implementation")
Signed-off-by: Daniel Machon <daniel.machon@xxxxxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://patch.msgid.link/20241009-mirroring-fix-v1-1-9ec962301989@xxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../net/ethernet/microchip/sparx5/sparx5_mirror.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_mirror.c b/drivers/net/ethernet/microchip/sparx5/sparx5_mirror.c
index 15db423be4aa6..459a53676ae96 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_mirror.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_mirror.c
@@ -31,10 +31,10 @@ static u64 sparx5_mirror_port_get(struct sparx5 *sparx5, u32 idx)
/* Add port to mirror (only front ports) */
static void sparx5_mirror_port_add(struct sparx5 *sparx5, u32 idx, u32 portno)
{
- u32 val, reg = portno;
+ u64 reg = portno;
+ u32 val;
- reg = portno / BITS_PER_BYTE;
- val = BIT(portno % BITS_PER_BYTE);
+ val = BIT(do_div(reg, 32));
if (reg == 0)
return spx5_rmw(val, val, sparx5, ANA_AC_PROBE_PORT_CFG(idx));
@@ -45,10 +45,10 @@ static void sparx5_mirror_port_add(struct sparx5 *sparx5, u32 idx, u32 portno)
/* Delete port from mirror (only front ports) */
static void sparx5_mirror_port_del(struct sparx5 *sparx5, u32 idx, u32 portno)
{
- u32 val, reg = portno;
+ u64 reg = portno;
+ u32 val;
- reg = portno / BITS_PER_BYTE;
- val = BIT(portno % BITS_PER_BYTE);
+ val = BIT(do_div(reg, 32));
if (reg == 0)
return spx5_rmw(0, val, sparx5, ANA_AC_PROBE_PORT_CFG(idx));
--
2.43.0
